I’m using Magento 2 EE version and implement the reward point. Currently, Magento will apply all of user point. I overrided the reward point block with an input for user to enter how many points he want to use. Then he will click a button to trigger an ajax. Here is my code so far:

I am new to Magento 2 and I’m not quite understand its structure yet. I’m using its sample data to investigate code. I want to override a .phtml file by using a custome module. The file I want to override is: